Van Dieman's - Natura Dualis Overcast Dual Tone Fountain Pen InkVan Diemans Natura Dualis Overcast The Natura Dualis collection by Van Diemans Ink explores the beauty of natural contrasts moments in the landscape where one thing transitions into another. These inks are designed to echo that duality, with rich multishading, riverlets, halos, colour splits and transformations that evoke natures layered complexity. Each ink in the series captures a fleeting threshold dawn into day, dusk into night, sun into storm,